Seems like a safe deposit box would be a better bet. You could also consider insurance on the appliances you need, and apparently metal shingles.
Any cash in a safe deposit box is counted as income. Expenditure is not income. If the government does not consider Bitcoin a currency or asset(at least when held by an individual), but merely an expenditure, then I can "pseudo-legally" own them without violating the savings rule. At least until they close that loophole.